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tmem.h - iomenu - interactive terminal-based selection menu |
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git clone git://bitreich.org/iomenu git://hg6vgqziawt5s4dj.onion/iomenu (git://bitreich.org) |
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--- |
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tmem.h (2610B) |
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--- |
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1 #ifndef MEM_H |
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2 #define MEM_H |
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3 |
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4 /* |
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5 * Lightweight wrapper over malloc, that permit to define a memory pool of |
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6 * multiple buffers, and free them all at once. |
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7 * |
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8 * *──────────┐ |
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9 * │ mem_pool │ |
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10 * ├──────────┤ |
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11 * │*head │ |
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12 * └┬─────────┘ |
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13 * v |
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14 * NULL< *───────────┐< >*───────────┐< >*───────────┐< >*───────────┐ >NULL |
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15 * \ │ mem_block │ \/ │ mem_block │ \/ │ mem_block │ \/ │ mem_block │ / |
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16 * \ ├───────────┤ /\ ├───────────┤ /\ ├───────────┤ /\ ├───────────┤ / |
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17 * `┤*prev *next├' `┤*prev *next├' `┤*prev *next├' `┤*prev *next├' |
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18 * │len │ │len │ │len │ │len │ |
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19 * ├─┴─magic───┤ ├─┴─magic───┤ ├─┴─magic───┤ ├─┴─magic───┤ |
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20 * │///////////│ │///////////│ │///////////│ │///////////│ |
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21 * │///////////│ │///////////│ │///////////│ │///////////│ |
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22 * │///////////│ │///////////│ │///////////│ └───────────┘ |
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23 * └───────────┘ │///////////│ │///////////│ |
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24 * │///////////│ └───────────┘ |
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25 * └───────────┘ |
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26 * |
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27 * This permits the type checker to still work on all operations while |
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28 * providing generic memory management functions for all types of data |
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29 * structures and keep track of each object's length. |
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30 */ |
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31 |
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32 #include <stddef.h> |
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33 |
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34 #define MEM_BLOCK_MAGIC "\xcc\x68\x23\xd7\x9b\x7d\x39\xb9" |
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35 |
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36 struct mem_pool { |
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37 struct mem_block *head; |
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38 }; |
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39 |
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40 struct mem_block { |
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41 struct mem_pool *pool; |
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42 struct mem_block *prev, *next; |
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43 size_t len; |
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44 char magic[8]; /* at the end to detect buffer underflow */ |
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45 char buf[]; |
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46 }; |
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47 |
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48 /** src/mem.c **/ |
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49 void * mem_alloc(struct mem_pool *pool, size_t len); |
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50 int mem_resize(void **memp, size_t len); |
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51 int mem_grow(void **memp, size_t len); |
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52 int mem_shrink(void **memp, size_t len); |
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53 size_t mem_length(void *mem); |
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54 int mem_append(void **memp, void const *buf, size_t len); |
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55 int mem_read(void **memp, struct mem_pool *pool); |
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56 void mem_delete(void *mem); |
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57 void mem_free(struct mem_pool *pool); |
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58 |
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59 #endif |
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